Electromagnetic waves

Reading: Chapter 32, ELECTROMAGNETIC WAVES

Study guide: Chapter 32

1. Maxwell's equations:
   1. modifying Ampere's law with the displacement current,
   2. the four Maxwell equations,
   3. $\Rightarrow$ a wave equation,
   4. ...for a wave that just happens to be travelling at the speed of light.
   5. Unification of electricity, magnetism, optics.
      
      
2. Particles vs Waves
   
   
3. E-M spectrum

Characterizing waves

Frequency

Frequency = # of waves passing a point in a time interval - [1/s] or [(cycles)/sec] or [Herz] =[Hz]

Seems like a larger frequency `implies` smaller wavelength

${\rm w a v e l e n g t h} \propto \frac{1}{\rm f r e q u e n c y}$

All other things being equal (particularly the amplitude), Higher frequency wave carries more energy than lower frequency wave: Imagine boats on the ocean being tossed up and down by these two waves.

Light from the sun